LG 42LG30 Series Service Manual Download

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LCD TV

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

CHASSIS : LA85D

MODEL : 42LG30

42LG30-UD

North/Latin America

http://aic.lgservice.com

Europe/Africa

http://eic.lgservice.com

Asia/Oceania

http://biz.lgservice.com

Internal Use Only

Summary of Contents for 42LG30 Series

Page 1: ...E SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS LA85D MODEL 42LG30 42LG30 UD North Latin America http aic lgservice com Europe Africa http eic lgservice com Asia Oceania http biz lgservice com Internal Use Only ...

Page 2: ...Inc All right reserved Only for training and service purposes LGE Internal Use Only 2 CONTENTS CONTENTS 2 PRODUCT SAFETY 3 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 9 TROUBLE SHOOTING 15 BLOCK DIAGRAM 24 EXPLODED VIEW 28 SVC SHEET ...

Page 3: ...hone jacks etc If the exposed metallic part has a return path to the chassis the measured resistance should be between 1MΩ and 5 2MΩ When the exposed metal has no return path to the chassis the reading must be infinite An other abnormality exists that must be corrected before the receiver is returned to the customer Leakage Current Hot Check See below Figure Plug the AC cord directly into the AC o...

Page 4: ...n your body by touching a known earth ground Alternatively obtain and wear a commercially available discharging wrist strap device which should be removed to prevent potential shock reasons prior to applying power to the unit under test 2 After removing an electrical assembly equipped with ES devices place the assembly on a conductive surface such as aluminum foil to prevent electrostatic charge b...

Page 5: ...e solder joints of the two original leads If they are not shiny reheat them and if necessary apply additional solder Fuse and Conventional Resistor Removal Replacement 1 Clip each fuse or resistor lead at top of the circuit board hollow stake 2 Securely crimp the leads of replacement component around notch at stake top 3 Solder the connections CAUTION Maintain original spacing between the replaced...

Page 6: ...ent 1 Temp 20 60 deg 2 Humidity 0 85 1 Application Range This spec sheet is applied to the 37 42 LCD TV used LA85D chassis 2 Specification Each part is tested as below without special appointment 1 Temperature 25 5 C 77 9 F CST 40 5 C 2 Relative Humidity 65 10 3 Power Voltage Standard input voltage 100 240V 50 60Hz Standard Voltage of each products is marked by models 4 Specification and performan...

Page 7: ...5 Full white Warm 5 500 6 500 7 500 pattern 8 Color Distortion DG 10 0 9 Color Distortion DP 10 0 deg 10 Color S N AM FM 43 0 dB 11 Color Killer Sensitivity 80 dBm 6 Component Video Input Y PB PR No Specification Remark Resolution H freq kHz V freq Hz Pixel clock 1 720 480 15 73 59 94 13 5135 SDTV DVD 480I 2 720 480 15 73 60 00 13 5 SDTV DVD 480I 3 720 480 31 47 59 94 27 027 SDTV 480P 4 720 480 31...

Page 8: ...freq Hz Pixel clock MHz Remark PC DDC 1 640 480 31 469 59 94 25 17 VESA VGA O 2 800 600 37 879 60 31 40 00 VESA SVGA O 3 1024 768 48 363 60 00 65 00 VESA XGA O 4 1280 768 47 776 59 87 79 50 CVT WXGA O 5 1360 768 47 720 59 799 84 75 CVT WXGA O 6 1366 768 47 13 59 65 72 DTV 1 720 480 31 50 60 27 027 SDTV 480P 2 720 480 31 47 59 94 27 00 SDTV 480P 3 1280 720 45 00 60 00 74 176 HDTV 720P 4 1280 720 44...

Page 9: ... Caution Care must be taken as afterimage phenomena may occur about the black level part of screen If leaving pause image turned on for more than 20 minutes especially inner digital pattern 13 CH Cross Hatch Pattern 09CH with significant black white contrast 3 ADC Set Adjustment 3 1 PC input ADC 3 1 1 Auto RGB Gain Offset Adjustment Convert to PC in Input source I2C COMMAND 0xF4 SELECT_INPUT 0x00 ...

Page 10: ...ng ADJ key Execute ADC Adjust by pushing G key at 0 ADC CALIBRATION 3 2 2 Confirmation We confirm whether 0xBF 480i 0xC8 1080i address of EEPROM 0xA2 is 0xAA or not If 0xBF 480i 0xC8 1080i address of EEPROM 0xA2 isn t 0xAA we adjust once more We can confirm the ADC values from 0xB9 0xBE 480i 0xC2 1080i addresses in a page 0xA2 Manual ADC Confirmation using Service Remocon After enter Service Mode ...

Page 11: ...3 41 96 0A CF 74 A3 57 4C B0 23 20 09 48 4C AF CF 00 31 40 45 40 61 40 81 80 A9 40 30 01 01 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70 40 36 00 C4 8E 21 00 00 1E 02 3A 80 18 71 38 2D 40 50 58 2C 45 00 C4 8E 21 00 00 1E 00 00 00 FD 00 30 60 58 1F 64 11 00 0A 20 20 20 20 20 20 00 00 00 FC 70 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 01 8A 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 02 03 18 F1 47 84 05 03 02 2...

Page 12: ... white pattern wb 00 1f End of gain adjust wb 00 20 Start of offset adjust Inner white pattern wb 00 2f End of offset adjust wb 00 ff End of White Balance adjust Inner pattern disappeared 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01 10 00 11 01 03 80 73 41 96 0A CF 74 A3 57 4C B0 23 20 09 48 4C AF CF 00 31 40 45 40 61 40 81 80 A9 40 30 01 01 01 01 01 01 66 21 5...

Page 13: ...djust Menu 7 White Balance menu and it is set to INNER as default If the adjustment cannot be done by the inner pattern select the HDMI to adjust Adjustment environment and reference 1 Environment illuminance Adjust it to 10 LUX or less at the place where the light source such as lamp should be blocked at maximum 2 Probe location Maintain the Color Analyzer CA 210 close to the module surface by 10...

Page 14: ... BOX 6 Perform the resisting pressure test 7 If it is not good the buzzer is operated to notify the test result to the operator 8 If it is OK the GOOD LAMP is turned and the stopper is moves down and it moves to the next process 8 2 Items to manage 1 TEST voltage GND 1 5KV min at 100mA SIGNAL 3KV min at 100mA 2 TEST time 1 second 3 TEST POINT GND test between Power cord GND and Signal cable metal ...

Page 15: ...BLESHOOTING Power Up Boot Fail Check P700 All Voltage Level 5V 12V 16V Check Power connector OK Replace Power board Y N Check IC704 2 Pin Voltage Level 2 6V Replace IC704 Recheck Y N Check X100 Clock 12MHz Replace X100 Y N Replace IC103 Flash Memory Check Q706 Output Voltage Level 12V or 5V Replace Q706 Recheck N Y Y ...

Page 16: ...e Only 16 Digital TV Video Check RF Cable Check IC400 LGDT Output AR401 AR402 Y Check Tuner 5V Power IC710 3 Pin Replace IC710 Y N Y Replace IC400 N Check IF_P N Signal Bad Tuner Replace Tuner Check Demodulator Input Clock X400 25MHz Replace it X400 N Y N Check Mstar LVDS output Replace Mstar IC100 N Y ...

Page 17: ... service purposes LGE Internal Use Only Analog TV Video Check RF Cable Check CVBS signal TU400 16 Pin Replace Tuner TU400 Y N Check Tuner 5V Power IC710 3 Pin Replace IC710 Y N Check IIC Line Check other IC ex LGDT NTP I O Y N Check Mstar LVDS output Replace Mstar IC100 N Y ...

Page 18: ...rnal Use Only Component Video Check input signal format Is it supported Check signal C1708 C1709 C1710 C1711 C1712 C1713 Replace it Check signal IC903 output R990 R991 R993 Y N Check JK900 JK901 Replace Jack Y N Y Replace IC903 N Y Check Component Cable Check Mstar LVDS output Replace Mstar IC100 N Y ...

Page 19: ...ck input signal format Is it supported Check signal Hsync Vsync R633 R634 Check other set If no problem check signal line Check R G B signal R640 R641 R642 Y N Check JK605 Replace Jack Y N Y Check other set If no problem check signal line N Check RGB Cable conductors for damage Y Check Mstar LVDS output Replace Mstar IC100 N Y ...

Page 20: ...Check input signal format Is it supported Check signal C635 Composite C634 C633 S Video Rear R615 Composite Side Check other set If no problem check signal line Y N Check JK600 Rear Check JK602 Side Replace Jack Y N Check AV Cable S Video Cable for damage or open conductors Y Replace Mstar IC100 Y Check Mstar LVDS output N ...

Page 21: ... HDMI Cable for damage or open conductors Check EDID NVRAM IC800 801 902 Power I2C Signal 5 6 Replace the defective IC or re download EDID data Y N Check HDCP Key NVRAM IC102 Power I2C Signal 5 6 Replace the defective IC Y N Check HDMI Signal Check signal line Y N Check IC802 Voltage Level 3 3V 5V Output Replace Power supply regulator Or IC802 Y N Check IC802 Clock Signal 26 27 Replace IC802 Y N R...

Page 22: ...1 Power 16V 3 3V 1 8V Check power supply regulator line Y N Check Connector P500 Y Check Mstar I2S Output R1048 R1050 R1051 Y Check signal line Or replace IC100 N Replace connector if found to be damaged N Check speaker resistance and cone for damage Y Replace speaker Y Digital TV Audio Check video output Follow procedure All source audio trouble shooting guide Y Follow procedure digital TV video ...

Page 23: ...e Follow procedure analog TV video trouble shooting guide N N Replace Mstar IC Y Check SIF buffer signal Check SIF Signal line N Y HDMI Audio Check video output from sourcedevice Follow procedure All source audio trouble shooting guide Y Follow procedure HDMI video trouble shooting guide N N Replace Mstar IC Check EDID NVRAM IC800 IC801 IC902 Power I2C Signal 5 6 Replace it or re download EDID dat...

Page 24: ...M Video Path Comp1 DVD DTV Comp2 DVD DTV YPbPr_2 YPbPr_1 AV1 S AV1 AV2 TU_CVBS AV_1 AV_2 MSTAR From Tuner RGB PC DTV RGB HDMI 1 HDMI 2 HDMI 1 TMDS TMDS Switch TMDS Switch HDMI 3 IF_P N S_Video1_Y C IC802 HDMI 2 TMDS HDMI 3 TMDS TMDS IC903 Switch Switch YPbPr IC400 LGDT 3304 LGDT 3304 TP MPEG Transport stream From Tuner IC100 ...

Page 25: ...h Comp1 DVD DTV Comp2 DVD DTV Comp1 AV1 AV2 S AV1 AV_1 AV_2 MSTAR RGB PC DTV RGB HDMI 1 HDMI 2 Comp2 SIF From Tuner NTP3000 Digital Amp IIS MNT_R L HDMI 1 TMDS TMDS Switch TMDS Switch IC802 HDMI 2 TMDS HDMI 3 TMDS TMDS HDMI 3 Audio Switch IC901 Comp IF_P N IC400 LGDT 3304 LGDT 3304 From Tuner IC501 IC100 TP MPEG Transport stream ...

Page 26: ...17H 3 3V 3 3V_MULTI IC709 SC156515M 3 3V_PVSB IC708 SC4215IS 1 2V_PVSB IC800 IC801 IC902 EEPROM IC803 TMDS351PAG IC901 COMP AUDIO SWITCH IC600 CAT24C02WI IC102 AT24C512BW IC501 NTP3000A IC500 AZ1117H 1 8V 1 8V_NTP 1 2 17 5 6 19 20 9 4 8 12 16V 12V 5VST AC_DET VAVS_ON M5V_ON GND 5V_MNT RL_ON 18 21 3 7 14 16 13 15 0 3 0 1 1 36 4 5 0 05 0 13 IC400 LGDT3304 3 3V_DVDD 3 3V_AVDD 1 2V_DVDD 2 55 0 2 0 05 ...

Page 27: ... 27 Copyright LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Mstar TUNER TDVF H051F Audio AMP NTP3000A I2C Design Demodulator LGDT3304 I O exp M62320 ...

Page 28: ... electrical and mechanical parts in this chassis have special safety related characteristics These parts are identified by in the Schematic Diagram and EXPLODED VIEW It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent X RADIATION Shock Fire or other Hazards Do not modify the original design without permission of manuf...

Page 39: ...May 2008 Printed in Korea P NO MFL41524414 ...

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